ARTHUR: New SPECIES OF UREDINEAE 473 
Davis writes that the rust has long since disappeared from the 
region. The other station at Western Union Junction, now known 
as Corliss, has become a plowed field, and of course the rust has 
been annihilated. 
Uromyces Spegazzinii (De-Toni) comb. nov. 
Uredo Spegazzinit De-Toni, in Saccardo, Syll. Fung. 7: 845. 1888. 
Oand I. Pycenia and aecia‘unknown. 
II. Uredinia amphigenous and caulicolous, scattered, or some- 
what gregarious, sometimes circinate, roundish or oval, 0.5-0.8 
mm. across, soon naked, cinnamon-brown, pulverulent, ruptured 
epidermis conspicuous; urediniospores oval or broadly elliptical, 
20-26 by 26-35; wall rather thick, 1.5-2.5u, dark cinnamon- 
brown or chestnut-brown, finely echinulate; pores 2, equatorial 
and opposite 
IIT. Telia amphigenous, Ages ges roundish or oval, 0.6-1 
mm. across, soon naked, pulvinate, chocolate-brown, ruptured 
epidermis conspicuous; teliospores ellipsoid or obovoid, 21-24 by 
29-35u, usually rounded above and below; wall chestnut-brown, 
rather thick, 1.5—2u, thicker above, 8-1ou, with a slightly paler 
umbo; pedicel nearly or quite colorless, oe. thick, about length 
of spore 
On Cotmmanes virginica L., Austin, Texas, Oct. 16, 1908, F. D. 
Heald & F. A. Wolf 232, with II]; Fisherman's Key, Fla., May 15, 
1901, S. M. Tracy 7230; C. elegans H.B.K. St. Croix, W. IL., 
Jan. 7, 1896, A. E. Ricksecker 5; C. erecta L., Key West, Fla., 
March 27, 1906, A. S. Hitchcock; C. angustifolia Michx., Jensen, 
Fla., Nov. 8, 1898, P. H. Rolfs 48; Miami, Fla., March 25, 1903, 
E. W. D. Holway, Dec. 29, 1905, Ernst A. Bessey 32. Common 
throughout the warmer parts of North and South America on 
Tradescantia and Commelina, usually in the uredinial stage. 
This species, like many other tropical and semitropical forms 
reproduces itself chiefly by means of the urediniospores, the telio- 
spores being rarely found. A collection from Texas, made by 
Messrs. Heald and Wolf in 1908, enables us for the first time to 
prepare a description of the telial stage. atch 
The type collection was made in Argentina by C. Spegazzini 
on Commelina sulcata and named Uredo Commelinae, a name that 
was given by Kalchbrenner two years later to a quite distinct 
South African species, subsequently called Uromyces Commelinae 
